The Oceanic Museum (Japanese: うみのかがくはくぶつかんOcean Science Museum) is a building located in Slateport City. In Ruby, Sapphire, and Emerald, the player must go there to give Captain Stern some parts from the Devon Corporation. There are ten people inside the building. A sign outside the museum reads:

The first floor contains information about the sea in the form of seven exhibits. There is also a reporter who asks the player to tell him a story about Pokémon. This report will later be aired on TV.

On the second floor, the player will encounter more members of the villainous team. Additionally, this floor has nine exhibits which include models of the Hoenn region and several cruise ships including the Royal UnovaORAS and the S.S. Anne.

Trivia

The museum can be entered free of charge before Team Magma or Team Aqua leave, as the reception believes that the player is part of their group. However, it only works if the player lacks the 50 fee, which will prompt the receptionist to believe that the player is part of either Team Magma or Team Aqua.